让我有下一个javascript对象。现在我想克隆它但没有一些字段。例如，我想要没有字段"lastName"和"cars.age"的克隆对象输入{"firstName":"Fred","lastName":"McDonald","cars":[{"type":"mersedes","age":5},{"model":"bmw","age":10}]}输出(克隆){"firstName":"Fred","cars":[{"model":"mersedes"},{"model":"bmw"}]}我可以做类似的事情varhuman=myJsonvarclone=$.extend(true,{